Add some better implementations for some bytes reading/decoding functions #6104
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This PR adds builtin replacements for various
Bytes.readfunctions as requested in #6100.I also took the opportunity to switch to the dedicated endian-fixing functions (instead of manual shift-and-or on bytes) for the assorted
decodeNat64belike builtins, because I'd built the infrastructure for the replacements.Pretty straight forward once I decided on a way to do the indexing. I'm not sure it's the absolutely fastest way to handle things, but every other idea I had for dealing with values that span multiple chunks was a lot more complicated.